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Finding the Fourth Proportional to 505, 757.16 and 212.68

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Solution

The fourth proportional to 505, 757.16 and 212.68 is: 318.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    505 : 757.16 = 212.68 : x
  2. Step 2: Convert to fraction form
    505/757.16 = 212.68/x
  3. Step 3: Cross multiply
    505x = 757.16 × 212.68
  4. Step 4: Simplify right side
    505x = 161,032.79
  5. Step 5: Solve for x
    x = 161,032.79/505
  6. Step 6: Final answer
    x = 318.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.